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Compare the levels of difficulty between SDLC models.

Answer:
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The Software Development Life Cycle (SDLC) is a process used for creating and deploying software applications. Different SDLC models have varying levels of complexity, due to the nature of their individual components. For example, a Waterfall model is more rigid and sequential, while an Agile model moves at a faster pace with more flexibility. Other SDLC models, such as the Spiral model and DevOps, have different levels of complexity depending on the project requirements and organization's needs.